JP4563133B2 - Manufacturing method of low residual stress seamless steel pipe for cutting rings with excellent straightness and roundness - Google Patents
Manufacturing method of low residual stress seamless steel pipe for cutting rings with excellent straightness and roundness Download PDFInfo
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- JP4563133B2 JP4563133B2 JP2004297696A JP2004297696A JP4563133B2 JP 4563133 B2 JP4563133 B2 JP 4563133B2 JP 2004297696 A JP2004297696 A JP 2004297696A JP 2004297696 A JP2004297696 A JP 2004297696A JP 4563133 B2 JP4563133 B2 JP 4563133B2
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- 229910000831 Steel Inorganic materials 0.000 title claims description 47
- 239000010959 steel Substances 0.000 title claims description 46
- 238000005520 cutting process Methods 0.000 title claims description 16
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 26
- 238000005482 strain hardening Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 description 22
- 238000005452 bending Methods 0.000 description 8
- 238000001816 cooling Methods 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000000137 annealing Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Description
本発明は、ベアリングレース等に使用される切断リングを供給する継目無鋼管において、長尺鋼管で適切な真円度を保ちながら、かつ該長尺鋼管を切断した鋼管切断リングにおいて優れた真円度を得ることができる切断リング用低残留応力継目無鋼管の製造方法に関するものである。 The present invention relates to a seamless steel pipe for supplying a cutting ring used for bearing races, etc., and an excellent roundness in a steel pipe cutting ring obtained by cutting the long steel pipe while maintaining an appropriate roundness with the long steel pipe. The present invention relates to a method for producing a low residual stress seamless steel pipe for a cutting ring capable of obtaining a degree.
通常、継目無鋼管の製造方法としてマンネスマン法が知られている。この製造方法で製造された継目無鋼管は、熱間加工（アッセルミル圧延）−冷間加工（コールドピルガー圧延）−熱処理−矯正−端面加工−検査なる工程により製品化されている。この工程における冷間加工後の残留応力除去を目的に熱処理を行なうが、その際に弓曲がりが発生し、この継目無鋼管の真直度と真円度を得るために、多ロールと２ロール矯正機でクラッシュを大きくして矯正しているが、製品内部に大きな残留応力が蓄積されるため、ユーザー等でリング切断した際、楕円に変形し真円度が悪化するという問題がある。 Usually, the Mannesmann method is known as a method for producing a seamless steel pipe. The seamless steel pipe manufactured by this manufacturing method is commercialized by the process of hot working (Assel mill rolling) -cold working (cold pilger rolling) -heat treatment-correction-end face processing-inspection. Heat treatment is performed for the purpose of removing residual stress after cold working in this process, but bow bending occurs at that time, and in order to obtain the straightness and roundness of this seamless steel pipe, multi-roll and two-roll straightening Although the machine corrects the crash by enlarging it, a large residual stress is accumulated inside the product, so that when the user cuts the ring, it deforms into an ellipse and the roundness deteriorates.
また、切断リングで真円度が特に要求される薄肉鋼管は、通常矯正後に残留応力を除去する目的で低温焼鈍を行い、その後弓曲がり、形状補正を軽いクラッシュで矯正を行なうことにより対応していたが、工程の長期化、工程費用のアップおよび納期の点で問題があった。これらの対策の一つとして、例えば特開昭５１−１０３０１１号公報（特許文献１）に開示されているように、加熱された鋼管の矯正冷却に際し形状変形を防止するための冷却装置が提案されている。 Thin-walled steel pipes that require roundness with cutting rings are usually handled by performing low-temperature annealing to remove residual stress after straightening, then bending the bow and straightening the shape with a light crash. However, there were problems in terms of lengthening the process, increasing process costs, and delivery time. As one of these measures, for example, as disclosed in Japanese Patent Application Laid-Open No. 51-103011 (Patent Document 1), a cooling device for preventing shape deformation at the time of straightening and cooling a heated steel pipe has been proposed. ing.
また、特開昭５２−７７８１２号公報（特許文献２）に開示されているように、加熱炉入側に１段の拘束ロールを置き、加熱炉出側に少なくとも２段の拘束ロールを置いて、出側に位置する通過中の管に対し出側１段目の拘束ロールを支点とする曲げ応力を加えることにより、加熱炉内部にある管部分に曲がり（長さ方向の変形）を矯正する力を与え矯正しつつ熱処理する方法が提案されている。 Further, as disclosed in Japanese Patent Application Laid-Open No. 52-77812 (Patent Document 2), one stage of restraint roll is placed on the heating furnace entrance side, and at least two stages of restraint roll is placed on the exit side of the heating furnace. By applying a bending stress with the first-stage constraining roll as a fulcrum to the passing pipe located on the outlet side, the bending (deformation in the length direction) is corrected in the pipe portion inside the heating furnace. A method of heat treatment while applying force and correcting has been proposed.
さらに、特開昭６２−１６１９１８号公報（特許文献３）に開示されているように、熱処理装置の入側に、鋼管を回転させながらその長さ方向に回転させつつ進行させるためのスキューローラテーブルと、その回転しながら進行する鋼管の一部を加熱するための加熱装置と、その加熱装置による鋼管加熱部を冷却するための冷却装置とからなる鋼管曲がり矯正を配設した鋼管の熱処理ラインが提案されている。 Further, as disclosed in Japanese Patent Application Laid-Open No. Sho 62-161918 (Patent Document 3), a skew roller table for advancing while rotating a steel pipe in the length direction while rotating the steel pipe on the entry side of the heat treatment apparatus. And a heat treatment line for the steel pipe provided with a steel pipe bending straightening comprising a heating device for heating a part of the steel pipe that proceeds while rotating, and a cooling device for cooling the steel pipe heating portion by the heating device. Proposed.
しかしながら、上述した特許文献１または特許文献２はいずれも加熱過程における鋼管の曲がりを拘束するための矯正手段によって真直度を得るものであって、鋼管内部の残留応力を除去し真円度を得るものではない。また、特許文献３は鋼管加熱部の冷却によって曲がりを防止するものであり、これも特許文献１または特許文献２と同様に、鋼管内部の残留応力を除去し真円度を得るものではない。真円度の悪化は残留応力の影響が大きく、製品内部に大きな残留応力が蓄積されるために、ユーザーで鋼管を切断した際、楕円に変形し真円度が悪化するための対策にはなっていないという問題がある。
However, both
上述したような問題を解消するために、発明者らは鋭意開発を進めた結果、ベアリング等に使用される切断リングを供給する継目無鋼管において、長尺鋼管で真直度を保ちながら、その長尺鋼管を切断して作製した鋼管切断リングにおいて優れた真円度を得ることができる真直度と真円度の優れた切断リング用低残留応力継目無鋼管の製造方法を提供するものである。
その発明の要旨とするところは、
（１）継目無鋼管を熱間加工後、冷間加工により形成し、次いで熱処理した後、矯正し、さらに該継目無鋼管を中心軸回りに回転させながら該継目無鋼管の軸方向に移動させる回転熱処理することを特徴とする真直度と真円度の優れた切断リング用低残留応力継目無鋼管の製造方法。
（２）前記（１）に記載の継目無鋼管が、外径と肉厚の比（Ｄ／Ｔ）が１３以上の薄肉継目無鋼管であることを特徴とする真直度と真円度の優れた切断リング用低残留応力継目無鋼管の製造方法にある。
In order to solve the above-mentioned problems, the inventors have intensively developed and as a result, in a seamless steel pipe supplying a cutting ring used for a bearing or the like, while maintaining the straightness of the long steel pipe, The present invention provides a method for producing a low residual stress seamless steel pipe for a cutting ring that is excellent in straightness and roundness, in which excellent roundness can be obtained in a steel pipe cutting ring produced by cutting a long steel pipe.
The gist of the invention is that
(1) A seamless steel pipe is formed by cold working after hot working, then heat treated and then straightened, and further moved in the axial direction of the seamless steel pipe while rotating around the central axis. A method for producing a low residual stress seamless steel pipe for a cutting ring having excellent straightness and roundness, characterized by rotating heat treatment .
(2) The seamless steel pipe according to the above (1) is a thin-walled seamless steel pipe having an outer diameter / thickness ratio (D / T) of 13 or more. Excellent straightness and roundness A method of manufacturing a low residual stress seamless steel pipe for a cutting ring.
以上述べたように、本発明による矯正後に回転させながら熱処理することで、自重による曲りや残留応力の少ない継目無鋼管が製造でき、ユーザーでのリング施削、熱処理後の手直し率、不良率を大幅に改善することが出来る切断リング用低残留応力継目無鋼管を提供することができる。 As described above, by performing heat treatment while rotating after correction according to the present invention, seamless steel pipes with less bending and residual stress can be produced, and the user can perform ring cutting, repair rate after heat treatment, defect rate A low residual stress seamless steel pipe for a cutting ring that can be greatly improved can be provided.
以下、本発明について図面に従って詳細に説明する。
本発明の製造方法は、例えばマンネスマン法によるもので、その製造工程は、熱間加工（アッセルミル圧延）−冷間加工（コールドピルガー圧延）−熱処理−矯正−回転熱処理−端面加工−検査の工程からなるもので、矯正工程における継目無薄肉鋼管の残留応力を回転熱処理により低減するものである。
Hereinafter, the present invention will be described in detail with reference to the drawings.
The manufacturing method of the present invention is based on, for example, the Mannesmann method, and the manufacturing process includes hot working (Assel mill rolling) -cold working (cold pilger rolling) -heat treatment-correction-rotary heat treatment-end face processing-inspection process. The residual stress of the seamless thin steel pipe in the straightening process is reduced by rotational heat treatment.
図１は、スリット法による残留応力評価方法を示す図である。この評価方法としては、図１（ａ）に示す、例えばＤ0 なる継目無鋼管径を有するリング幅２０ｍｍのものを、図１（ｂ）に示すように、リングに幅３ｍｍのスリット加工を施し、スリット加工後の外径変化率により残留応力を評価する方法であり、残留応力（外径変化率）は、スリット加工前の直径Ｄ0 、スリット加工後の直径をＤとすると、（Ｄ−Ｄ0 ）／Ｄ0 ×１００（％）で表わされる。この値が正であると試料全体の平均残留応力が引張りで、その値が大きいほど残留応力が大きいことを意味する。 FIG. 1 is a diagram showing a residual stress evaluation method by a slit method. As an evaluation method, a ring having a seamless steel pipe diameter of, for example, D 0 shown in FIG. 1A and having a ring width of 20 mm is subjected to slit processing with a width of 3 mm as shown in FIG. 1B. is a method of evaluating the residual stress by the outer diameter change ratio after slitting, the residual stress (outer diameter change rate), slitting the previous diameter D 0, the diameter of the post-slit and D, (D- D 0 ) / D 0 × 100 (%). If this value is positive, it means that the average residual stress of the entire sample is tensile, and the larger the value, the larger the residual stress.
図２は、真円度測定方法を示す図である。図２（ａ）は真円度測定方法での半径法であり、図２（ｂ）は直径法である。半径法は専用の真円度測定機で測定し、直径法はスタンド１´上に試料２を置き、試料２を回転させてダイヤルゲージ４やノギスなどの汎用測定機を用いて測定する。一方、半径法はターンテーブル１上に試料２を設置し、全体を回転させながら接触子３を試料２に接触させて円周方向を連続的に測定し、測定機により自動的に偏心補正および傾斜補正するため、人による誤差が少なく再現性が高い。また、作業効率も良い。一方、直径法は目視読み取りのため、人による誤差が大きく、再現性も低い。そこで、直径法よりも精度の高い半径法を採用し、また、真円度測定機にはテーラーホブソン社製のタリロンドを使用した。
FIG. 2 is a diagram showing a roundness measurement method. 2A shows the radius method in the roundness measurement method, and FIG. 2B shows the diameter method. The radius method is measured by a dedicated roundness measuring instrument, and the diameter method is measured by placing a
以下、本発明について実施例によって具体的に説明する。
図３は、本発明に係る回転熱処理炉の全体概念図とローラー形状を示す図である。図３（ａ）は上面図であり、図３（ｂ）は側面図である。コールドピルガー圧延で得られた継目無鋼管を矯正後、回転させながら熱処理を行なうものであるが、その熱処理条件としては、６００〜６７０℃×１．０〜１．５Ｈｒ加熱し、図３に示すように、熱処理炉５内のＶ溝搬送ローラー６をスキューさせることで材料が長さ方向に搬送されながら回転して熱処理を行なう。一方、比較材としては矯正後、回転熱処理をしない従来工程材を用いた。その結果を表１に示す。表１に示す綜合評価として、○：真円度良好、かつ残留応力少、△：真円度劣り、かつ残留応力あり、×：真円度悪く、かつ残留応力も多い、で評価した。
Hereinafter, the present invention will be specifically described with reference to examples.
FIG. 3 is a view showing an overall conceptual diagram and a roller shape of a rotary heat treatment furnace according to the present invention. FIG. 3A is a top view, and FIG. 3B is a side view. The seamless steel pipe obtained by cold pilger rolling is straightened and then heat-treated while rotating. The heat-treating conditions are 600 to 670 ° C. × 1.0 to 1.5 Hr, and FIG. As shown, the V-
表１に示すように、Ｎｏ．１〜１０は本発明例であり、Ｎｏ．１１〜１５は比較例である。比較例Ｎｏ．１１〜１５はいずれも継目無鋼管を矯正後回転熱処理をしない場合であって、真円度は悪く、かつ残留応力の存在していることが分かる。これに対し、本発明例であるＮｏ．１〜１０はいずれも真円度が良好であり、かつ残留応力の少ないことが分かる。これからも継目無鋼管を矯正後の熱処理において、回転させながら熱処理を行なことにより、優れた真円度が得られ、かつ熱処理後の製品での残留応力のないことが分かる。 As shown in Table 1, no. 1 to 10 are examples of the present invention. 11 to 15 are comparative examples. Comparative Example No. Nos. 11 to 15 are cases where the seamless steel pipe is not subjected to rotational heat treatment after straightening, and it is understood that the roundness is poor and residual stress exists. On the other hand, No. which is an example of the present invention. 1 to 10 all have good roundness and little residual stress. From this, it can be seen that excellent roundness can be obtained and there is no residual stress in the product after heat treatment by performing heat treatment while rotating the seamless steel pipe while rotating.
１ ターンテーブル
１´ スタンド
２ 試料
３ 接触子
４ ダイヤルゲージ
５ 熱処理炉
６ Ｖ溝搬送ローラー
特許出願人 山陽特殊製鋼株式会社
代理人 弁理士 椎 名 彊
1 Turntable 1 '
Patent Applicant Sanyo Special Steel Co., Ltd.
Attorney Atsushi Shiina
Claims (2)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004297696A JP4563133B2 (en) | 2004-10-12 | 2004-10-12 | Manufacturing method of low residual stress seamless steel pipe for cutting rings with excellent straightness and roundness |
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| JP2004297696A JP4563133B2 (en) | 2004-10-12 | 2004-10-12 | Manufacturing method of low residual stress seamless steel pipe for cutting rings with excellent straightness and roundness |
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| JP2006111892A JP2006111892A (en) | 2006-04-27 |
| JP4563133B2 true JP4563133B2 (en) | 2010-10-13 |
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| CN114368134B (en) * | 2022-01-18 | 2023-12-29 | 宁波江丰复合材料科技有限公司 | Straightening method of carbon fiber pipe fitting |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5321022A (en) * | 1976-08-10 | 1978-02-27 | Kawasaki Heavy Ind Ltd | Solution heat-treatment method for thin circular pipe of large diameter |
| JPS54112309A (en) * | 1978-02-23 | 1979-09-03 | Mitsubishi Electric Corp | Heat-treating apparatus for steel pipe |
| JPS5787050U (en) * | 1981-06-26 | 1982-05-28 | ||
| JPS61257419A (en) * | 1985-05-09 | 1986-11-14 | Nippon Yakin Kogyo Co Ltd | Annealing method for pipe using material having low high-temperature strength |
| JPS62161918A (en) * | 1986-01-10 | 1987-07-17 | Kawasaki Steel Corp | Heat treatment line for steel pipe |
| JPH03197622A (en) * | 1989-12-26 | 1991-08-29 | Ito Kogyo Kk | Transporting device for solution-heat treatment of pipe material |
| JPH10137850A (en) * | 1996-11-08 | 1998-05-26 | Sanyo Special Steel Co Ltd | Method for straightening low residual stress of seamless steel tube |
| JP2001329316A (en) * | 2000-05-22 | 2001-11-27 | Sanyo Special Steel Co Ltd | Manufacturing method of seamless steel tube with less residual stress |
| JP2003342689A (en) * | 2002-05-29 | 2003-12-03 | Sumitomo Metal Ind Ltd | Medium carbon steel pipe, low alloy steel pipe, and their production method |
-
2004
- 2004-10-12 JP JP2004297696A patent/JP4563133B2/en not_active Expired - Lifetime
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5321022A (en) * | 1976-08-10 | 1978-02-27 | Kawasaki Heavy Ind Ltd | Solution heat-treatment method for thin circular pipe of large diameter |
| JPS54112309A (en) * | 1978-02-23 | 1979-09-03 | Mitsubishi Electric Corp | Heat-treating apparatus for steel pipe |
| JPS5787050U (en) * | 1981-06-26 | 1982-05-28 | ||
| JPS61257419A (en) * | 1985-05-09 | 1986-11-14 | Nippon Yakin Kogyo Co Ltd | Annealing method for pipe using material having low high-temperature strength |
| JPS62161918A (en) * | 1986-01-10 | 1987-07-17 | Kawasaki Steel Corp | Heat treatment line for steel pipe |
| JPH03197622A (en) * | 1989-12-26 | 1991-08-29 | Ito Kogyo Kk | Transporting device for solution-heat treatment of pipe material |
| JPH10137850A (en) * | 1996-11-08 | 1998-05-26 | Sanyo Special Steel Co Ltd | Method for straightening low residual stress of seamless steel tube |
| JP2001329316A (en) * | 2000-05-22 | 2001-11-27 | Sanyo Special Steel Co Ltd | Manufacturing method of seamless steel tube with less residual stress |
| JP2003342689A (en) * | 2002-05-29 | 2003-12-03 | Sumitomo Metal Ind Ltd | Medium carbon steel pipe, low alloy steel pipe, and their production method |
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| JP2006111892A (en) | 2006-04-27 |
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